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determine not only overridden methods from the superclass but also the chain of calls leading to the current method call which is how the class system knows whether to invoke the function or throw an error. Like real protected methods, MooTools protected methods are also available to inheriting classes: var Person = new Class({ // Properties name: '', age: 0, // Methods initialize: function(name, age){ this.name = name; this.age = age; this.format(); }, log: function(){ console.log(this.name + ', ' + this.age); }, format: function(){ this.name = this.name.capitalize(); this.age = parseInt(this.age); }.protect() }); var Mark = new Class({ Extends: Person, initialize: function(){ this.name = 'mark'; this.age = '23'; this.format(); } }); // Creating a new Person instance var mark = new Mark(); mark.log(); // 'Mark, 23' mark.format(); // 'Error: The method "format" cannot be called.' Even though our format method is protected, our Mark class still has access to it since the class inherits from our original Person object. The format method still works as expected, and still throws an error if called directly. The implementation of protected methods in MooTools while perfect for most use cases can be a bit weird unless you know the internals. One particular gotcha is when protected methods are used in closures:

Through at least Hadoop 0.19.0, the DataNode has two periodic tasks that do a linear scan of all of the data blocks stored by the DataNode. If this process starts taking longer than a small number of minutes, the DataNode will be marked as disconnected by the NameNode. When a DataNode is marked as disconnected, the NameNode queues all of the blocks that had a replica on that DataNode for replication. If the number of blocks is large, the NameNode may pause for a noticeable period while queuing the blocks. The only solutions for this at present are to add enough DataNodes, so that no DataNode has more than a few hundred thousand data blocks, or to alter your application s I/O patterns to use Hadoop archives or zip files to pack many small HDFS subblock-size files into single HDFS files. The latter approach results in a reduction in the number of blocks stored in HDFS and the number of blocks per DataNode. A simple way to work out how many blocks is too many is to run the following on a DataNode: time find dfs.data.dir ls > /dev/null If it takes longer than a few hundred seconds, you are in the danger zone. If it takes longer than a few minutes, you are in the pain zone. Replace dfs.data.dir with an expanded value from your Hadoop configuration. The timeout interval is 600 seconds, and hard-coded. If your ls takes anywhere close to that, your cluster will be unstable.

Figure 5-12. A SharePoint form library With SharePoint 2007, there are two ways to publish an InfoPath form template to SharePoint you can either publish to a form library or as a content type. Content types are new in SharePoint 2007 by publishing a form library to SharePoint as a content type, you make that form template available to SharePoint users to create new form libraries based on that form template. Let s take a look at the two methods.

HDFS is a wonderful global file system for a medium number of very large files. With reasonable care and an understanding of HDFS s limitations it will serve you well. HDFS is not a general-purpose file system to be used for large numbers of small files or for rapid creation and deletion of files. Through HDFS 0.19.0, the HDFS NameNode is a single point of failure and needs careful handling to minimize the risk of data loss. Using a separate machine for your secondary NameNode, and having multiple devices for the file system image and edit logs, will go a long way toward providing a fail-safe, rapid recovery solution.

var Thing = new Class({ test: function(){ var self = this; (function(){ selflog(); })(); }, generate: function(){ var self = this; return function(){ selflog(); }; }, log: function(){ consolelog( Yes ); }protect() }); var obj = new Thing(); objtest(); // Yes var fn = objgenerate(); fn(); // "Error: The method "log" cannot be called' Our class Thing has one protected method called log and two public methods: test and generate When we call the test method, it creates a single-execution function that calls the log method Because the single-execution function is created, invoked, and destroyed within the context of the test function, the call to the log method succeeds, since the whole procedure happens from inside the context of the method On the other hand, generate returns a function that calls log inside its body, creating a closure.